Making T3 Or E3 Connections - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Making T3 or E3 Connections

Making T3 or E3 Connections
Each LM-3T3 and LM-3E3 line module (BNI backcard) provides three ports with a BNC connector
each for the XMT trunk output and for the RCV trunk input.
Each LM-2T3 and LM-2E3 line module provides two ports with a BNC connector each for the XMT
line output and for the RCV line input.
To make the T3/E3 connections to each port:
Step 1 Bring each cable through the opening at the bottom of the cabinet at the back and route them up the side.
Step 2 The BPX switch has velcro tie-downs inside the cabinet to hold cabling in place. Pull the tie-downs
apart as applicable, place the routed cable in position, wrap the ties around the cable and remake the
loops by pressing the two sections together.
Step 3 Connect the cables to the BNC connectors on the LM-3T3 or LM-3E3 line modules.
Remember, the RCV is an input to the BPX switch and XMT is an output from the BPX switch. The
ports are numbered from top to bottom as indicated in Figure 14-1.
Note
Record which slot and port number you are using for each trunk or line. You'll need this information
Step 4
later when configuring the network.
If optional Y-cable redundancy is desired, locate a 3-way BNC Y-cable adapter for each port to be so
Step 5
equipped. As an alternative to the Y-cable, use a BNC "T" and two short, equal-length BNC-BNC
cables.
For card redundancy, make sure there are two appropriate line modules equipped in adjacent slots.
Step 6
Connect two legs of the Y-cable to the XMT T3 or E3 connectors on the same port on each of the two
Step 7
line modules (see Figure 14-2). Do the same with the two RCV T3 or E3 connectors.
Connect the third leg of the XMT and RCV Y-cable adapters to the XMT and RCV trunk cable.
Step 8
Cisco BPX 8600 Series Installation and Configuration
14-2
Maximum distance from a BPX switch to a DSX3 cross connect point is
approximately 450 feet (150 meters).
Chapter 14
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Connecting Cables